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Patents > IPCs : IPC B64B1/58 or IPC B64C13/42 & Number of figures: 3-4

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LTA (28) · frame (8) · balloon (7) · propulsion (5) · airship (4) · car (4) · construction (4) · hybrid (4) · propeller (4) · design (3) · navigation (3) · dirigibles (3) · airplane (2) · gas (2) · compartments (2) · balloons (2)
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